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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9fa35f8f7a06de56c367927e19d2ae5d2a963c77bee485fea1a528c03200e8' 
  AND token = 'YQSiK1ieYhh5Of5bh+PU6MPD/TTl4YVTn19/SbSwc3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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