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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cecb0c7b040db9a1e230ba3038cd682a20574b7c401fe34b4a3a35b50e0824' 
  AND token = 'm8sb6tJkdOhoHtLPL0VmdBUxgOW94M788BWZSnIDUpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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