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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35ea7f25a3dcc4ed5304f02591ba79868bc6637427e6a823c41fcba4e583311' 
  AND token = 'GT0v/plT2+Z2OeAiMAR+gHjfuSUl1IOYcl96StRxBUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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