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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf3a982dfb30aa28b6364721e08aca2eb35510a0c1ab15de211f45dd1b558c5' 
  AND token = '0a/E2P8JqeAkzZq9CPtQPi/A9hF+awOtnajjRADQHSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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