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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6aa4bff11c4f3302e45ad6bd95e98c8fa2e8a53a72a7c24ec64d249a930808' 
  AND token = 'iCPIn05/FrrE6vJWvyP7sdUq/vJw3YWd3VtLbuYRMzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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