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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c4411e4dc11ea7c8f80811e33e2ea524048578f8970fa4ed4770df15e3048a' 
  AND token = 'hGHVv7myKLp1oPF4hkXv5N2SxirlpTf9GduNKYD8NGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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