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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa74401468b2ff4d5fdd267c24d02328e9a1d8fc2abf614e721998ef8b4351a' 
  AND token = 'Ue0joKlAnApAdIvycV6g+Nio7iXAU0FNi64gNmqR4SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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