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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e2e9b12a736dae68777d19e24b3d8d36dd0cbe950ccd60636ad83e45442c51' 
  AND token = 'Bvu2vxhoVonNEsPNB5r0kYPcelm2kaHA9F4nuWUpYEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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