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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad7585e26c003a5c6af310b5f8b2e668f70c6110b6d18a6832cd8b51c70bd51' 
  AND token = 'J/lpf/CUjCnNKexBq7QvCaZ7HhReT58xgqUpR6RGbm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}