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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc62ecd70cd7bcf21a0d726cbeef6f045e06f1664ae68c88090b1b8c4a31d15' 
  AND token = 'vjy7eVWgS8Sf5YnTNBktb3JrQu5snbW8Oz3fHaCNXyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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