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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2bf6c916350b0bd0177922ac08a0eb11fa7ae21e402812cec8406b956389f8' 
  AND token = 'fxbbBK71MHrqR+pJK8CH9/ZYwyJcwneCrdlgwwEgglg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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