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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c934896e4be82f9abd6cad8a40e073f9d3ee4492d8dcfff0c1bbec00dec7cd' 
  AND token = 'Jqx4eWNU1QlRaH5sjrxvfExQ+S2BCXrAiEGm878WejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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