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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5391d4d6313578311bd76f791b6f058f83b515ce3d5e33f476cfd5954a7ab499' 
  AND token = 'kJUxGoDG9H+v4SKNKB5yefWpXewWoieZDCiI6bf0098=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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