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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7dcd85bb5d49a4a16c247e6f507a9b3cb1b6121d881405a4ef5aa31e8c602f' 
  AND token = '9Y8+SF4Nfkq0tmHOPFZqfQzT6fMjts0PlWlXV79LAo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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