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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7ca60de7eccb009f54026fd815ad89e93ac36b8fd1ceb5b6afbda9429b8b20' 
  AND token = 'Shl69XvK48a9VplgeoZuKhH7laKOvulm81sN5bBFqvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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