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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c63be28a133ee2c36a4f3ffb06b744722137e91dd4c1ea2e24b9ac258c21cb' 
  AND token = 'xLgiMpn0SZ/dZ2KYU3I+Z+ejB7R0RjJ31IBZQ+/PDZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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