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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff356a68e6043a8d84b1fb2fa7d42c98e8e9e5c2efda6c6a2502bdddbb6449d' 
  AND token = '88znZxcSZD3Ysu6ZbC4C1Bt3OxyV8sYPE4ZDDAq+1ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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