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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59acd863ffbcf9db61eb3e72906602bed9879675860017b6b3bda55ed5ab6766' 
  AND token = 'olt27BBEMmeg7haWJ85GP7BsLyfkUO8Arbfl/nT1Uwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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