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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5ae61ceb5f68a635d0e66277eb59d8f9622989eb29844d884f743bfecaac43' 
  AND token = '9hlTw5H6pNnKUX0hmpi1iFTkLH6S5ziY2I+NMkKg84s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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