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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e3b098d7d73753737c22d517da5418d5f8c2b30c999f134ac1d019fdf9bf24' 
  AND token = 'jk8AXafrludczuhaRc6AC2jepkQLIgXv9qRNWRJypLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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