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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f0f7e5d4e2d6716f09cd3cf91ff92a928d9c438a8135e416f19f162fd7e8d9' 
  AND token = '/U/oAg3P1xBpS0yp66JYpZp9ouUSq9hOxGo+8qxlgZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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