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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a965066ef0c5f65353e206fc233052b23d528831ee2de7d2567405332dad5365' 
  AND token = '/EORfU9w4Bm66mUDk0Fkxulrv3UHvhADiacjXEiLBsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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