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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51750a27efbb59ee60a99f7edea4609ac84017a920bad61e540187134d2f436' 
  AND token = '9GfGTw6SaWEG9lxpVw5YZp9gHyz4FDroZ/uCzx6sIFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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