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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d792ee9f705b8649bb668c4c126d8f959e4ff739dca632f1d9bf84a52e6585' 
  AND token = 'wnG6kRjK13cneW5j8LRdX++SMKHHj1Cbi8lqMOVxI6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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