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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3363de0ccec449ac80ae4d35d9fc9fd9f3a826ee74b6612cf3f8efe753ea44' 
  AND token = 'DvmgvKQrnQd1woJYySM7qoU8ViRjS5X5rJ7KYTQmOVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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