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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482ccdeb3b582f555eecc0c2308048430d7c31dc73e518004b250ebe4d19bb20' 
  AND token = 'YgvhglisaJ1XMuh1QH03GGMFqgnMr1/E8Ygp8JBbyN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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