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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a0ae9020615657315031516325ee5e7a33b9928569343611013586f59ede6b' 
  AND token = 'sV+F8IPX88DzTVttSrr+pZVbWqxa1y1QH7nDxmFJnI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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