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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d205d9b7b3f6a60350665f71e4dd84504611920b10b3fd81b48c6b4ea202a0c' 
  AND token = 'FSC6tMZLgONvSD/JXqyhm9O9xSpL31kjJMkEuQtf2z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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