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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32503b0ff827cfb6ec6b52cfcc684568c0ef8c8a2b7de271ee14f4d60da2965d' 
  AND token = 'brzo433W28tUfyXRHJVV+7wu2Yo8n13rxqQgxjiTSTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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