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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e7812916ec5bb76441d368b597649ac7c1b6c78d6fc46f3e3540967baca347' 
  AND token = 'A3h8Yxrr3/L7CK7RDC28O1sm8wutH2dLJjzNNWWwE5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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