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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce3e844875d0cd9d3d59bf7ddbaca5d3db8a7976444672255e4634f2b340e84' 
  AND token = '+8jf+cmTAgxaUfHPWGF1Ee78jpmfv73xEyES6e7H1Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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