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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9989411cf75828f3a40279a7772c38d89be86dc49f669bae2c60f9cc425ef83d' 
  AND token = 'Rvht4kG0FDZFNX5J1wiKr89v/1P6JCb7csdHmV3Mm6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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