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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b49f9fa690d0f7511ce1b2f56e3ec8e795094310ae5d5af7162ee0a26217db8' 
  AND token = 'MZrUni1/ilzEpEs/exp37vqxDJMm61Ep49Dk5fSLbEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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