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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5284144d4678260ed999d8cbedd74d77ccb2ee75ef396f55feaf779fec668c7e' 
  AND token = 'OnBZeUb9xNEtDlxldvgI8RNGCjIZUSea759DzEKA6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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