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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796dece10a779ebd81de7ca72722358cf95c98c0024dd23d791f597e02a8a7c7' 
  AND token = '/U0s7jEE/28yljsfvwBd2FA3oiCQpsNoZNa19NxLM0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00494

JSON explain

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