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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a4df284f3da0a5b835eedcec5c305f2f0d5d21b03bb40cd0fddeaebb092f4d' 
  AND token = 'yfgS/VXsQ44RGkfiDbCbSmfBn2RROoignpmFku8NijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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