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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c7285a66d9a02823c4a94b9d19570c28c9ba1916b23e719eb1b416156ed975' 
  AND token = 'MoU+PDLhz0tjXsskWBTgfpveifZSF4uP+0W3ETQ/DTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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