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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db176ff2cd9d7a9b2cc56acb65ece58031b565472ccb793b8050a6bab7a5e67' 
  AND token = 'HDjnJYOxuQWV7gEszBIg5C7uAD3JegciBvk/rlZ7A+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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