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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bddf0dffd7827f310c565ec182fde5c33ef1a9c4c714e0c692553688852f8d4' 
  AND token = '96Mov+9L5w2SENpadLHdwd5UzgHaHlLD8i1WwMP0Lrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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