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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573a3d25090818bab533a2f3be8c72f70e30ac3483306bb0ab1b76f2e7ce45bd' 
  AND token = 'ojsT6ZeEceJ6dygZHj4E6zQz894Sell1TnjSbmj50LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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