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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e954fd7b844fc8353ca4880d4d443fa84b591fc589e37146237d2918930468e6' 
  AND token = '11oGhow89hgV+kY52t0XNc6WUU2QUzIwnRZgsR1mM+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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