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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0722b2dac7a40e75b479336b2c3b6d92b3c34eab9b0a010af5dd1d60bb2059' 
  AND token = 'YNX+ibGBf3EUawy5y8aPe4W+xzWKT/VYLGdhAdxg44k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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