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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edc589f316817f7a321d19949ae1cd954da946e4ad1766ffe5856e9c1914a32' 
  AND token = 'C0DhynSONPQzcprMc+q/SC1FMlX6ej0As02jRr+vV40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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