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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4869635d084b7279ae58f83d619749b86c725581946d541d1bd6406ef39819f' 
  AND token = 'dfpIUuUFYAf9sRAzpwcoQiaEk2f144qj13UCFz+1w/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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