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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9ef7292d196f48e8baf4a649a26c0e8ce64cf15f9fa1bc3d31dc1d76030183' 
  AND token = 'PVB93zuB0DVDGkTAPPQTnQjUH/boPFvDCWcWl71/4fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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