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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4066b54d1fbe6a14c9b950736c9f8e486df137b099608fca8813ff1a6c26a2' 
  AND token = 'bLf0OcOTo9JwcqebVXTI/QzRRH1WbTwRprXfDofkdRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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