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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fe8f90487c8080b519a1cc56a1a9c23dfcb753261a9301ce0210a3e021072e' 
  AND token = 'IJkN01Jqo99zSm0G9ARKwrFwsRh0Mk3FmdQuyA8ZqJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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