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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560032b4ab3d0211087fdb634932934e035dfe9b5bb0a0c1fc7a0f7a9c0c91d5' 
  AND token = 'G7CMdItUM07PTD6bTr9IDjF5TMLnvuRD4EuQKGIQyMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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