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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2c033edaed61dcab0f89edc243310d971f6221075bfb0b237f42e4a9cc8f12' 
  AND token = 'B/ORRGH24AUOScTwi5/doUzlmGrk1V4UDhqrTScpKfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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