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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a34932427a9d9dd1956ecf490cdf8b02b1c8e7e01e7d4bbc7bc356437644ed2' 
  AND token = '+3Ue0HI3sR/rDVfyL7HOgQqio6y+k2e1mLz/wkiVxAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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