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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54559256d019f828c6eef46875bbad193e8b7a3527b9da5fdd0266da477d9cce' 
  AND token = 'CxkZdS89t9rx1tEY9mpPzsoCjkIS9cvAHOjXXRXByNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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