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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3e2d3ac73edd7881dfb9d463658a6207f64d5eb7ef4fd744b5339b3d73490e' 
  AND token = '7Jy1xge3lR4Z0IF3ItmFdYAdtT2HEg0sJKvMkRbh/Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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