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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4926f110b0534ca8345257e1b17326081743b5ccf47bb4cafd74b52fef839c17' 
  AND token = 'Ifd8dOGQyLYhIN8NFeg5Eb1Lp8U/2I+yPgyoJ2WLI7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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