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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2688c742579294a769dbf898cb8ce356745d8871bf5e27729565e126eb3173' 
  AND token = 'bxjHAqj7TyZaHPiOI1hgr8l8GC/k/WpxCnr2cp7I1uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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