SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7caf0935bd60826e786f0ed624b776659a1e88c7b5ddc4f66b59437f21978986' 
  AND token = 'KKNr3vxnh3qTO0B0BhEfAvQm1UY/ESrDzV8z0dsK0gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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