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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136edcd4ac06b33e7251b56ae261d9af7c366059300d24b578039a7ca448ec6a' 
  AND token = 'Qb9r5Dal+6P+ebWRFNIuhnDwN+phvcAbkN3izFu/sk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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