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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b5a404e94a031eaa569dbed8ecc68289531ef8896849fdf4464c5a1a27bd0a' 
  AND token = 'az05GGYoSSq2nP2bECUiHdVJ09VZj4LLoyukdfhY4r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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