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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b60e1f3df26274a64e8ad347dedcb3bf47f234423f911d77fe2d65c8de5ceb3' 
  AND token = 'OekAI0L9NOFzhukWcj+bSWHnbOH4QKkq/GvGXmMcZoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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