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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3c4fe94987d2ac17e537f266443a65aa93ae01d118a59edafb4fc6e447f24b' 
  AND token = 'hSiDxR000JBDe99vgsaT15FEfwEL+k2IKT5QXqtVC3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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