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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360ec7b90dd77c24c4e267f0711967e9710cd5258ca3e92a8e91fff40b3ea451' 
  AND token = 'ifZMDHMkrGYNJi5MtiwIZEp1S2dzVIn3/SkLpVkTCBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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