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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d6e524ec3053d705b880632369f646a3c98793ed331479b23de8ff703731e8' 
  AND token = '+1e4bbNWngIUELyxrB0hLMBRYU9AXqTdOfXy3zCrjZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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