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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cb9cdeccd451437f69fd482c9f384e3d21f0ec1fe200ac7c93f66893c5a58b' 
  AND token = 'Bxjd9IjVV2pDtKYPJy4qsbHLL1oceE/36xAf0js8Moo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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