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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdebd49b03b546d087b1712d43b5bc6be99d9e5908fbcac8cbba2046b83d58e' 
  AND token = 'f8idEmKaaNX99srow4Fsa6hzStbL+4CTkH6dIlNBwkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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