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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9189dc70d2f6ff0d548167dd2d1a06c998af63d369095d9a106f36194072790' 
  AND token = 'n+J+Gg9Rr+WS+sG99333ohkhxrCFwQvPVopzL+zuF1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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