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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e595dcb278083ea3606c65f96a620cfc9c10ab12bf826df8c0e6b7e73ebf32' 
  AND token = '8RBok/WHQOGX1ZDAGQ9Fj+F/HtHtbeKHMVNGL1DGAzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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