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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a898daa0dcfddf273059c5d6cc882faed350d63620afeca4e0c6a7f0ff9d37d' 
  AND token = 'bky6foNVUeSK5ZuxxMTkHfYNY2RpcFyD3HCvmiYBJw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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