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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7362cb60d6199179767a5507cd0445dbe5914511c926510e6bc8faf96267b69b' 
  AND token = 'ZxuqGbAqWxPsMmSX+gx8dCR0X0RZzpsK/4b3n4hLOtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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