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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0018c4704981f5a848a646d2593a7df03678661541a36c5dce80229297b28048' 
  AND token = 'UfTXXLJnt+AMc5xeYA9uhR/oVKgxM8XopNLakw974Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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