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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dab2156df172b9293b952cfc5a80f426f256d6d9ee7fac08c400bb2eefa699' 
  AND token = 'QzSkVcRQINGUmPlV6F0M06eEAx+31Ifs+lWp+XdwLng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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