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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec6e56b70f5e2351199ab85828535239b47f622934f801e2ca44ca608125647' 
  AND token = '05y9ZEgCSpqSI8HzPEIq+2yFUdR+jyQ70o+yTCabRjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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