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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26de11f8f68415c7c8282ad896b4e212e03e957f3928fb6b80f853a838b02d4e' 
  AND token = 'X+gMsUufuH8AruZbsDFFrEiH/rf86f4lzlgJFHpZaEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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