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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9b190037e6a36884ff0dd8c1c9fd99df00d1fc76d0512dbd25862d7c6523cd' 
  AND token = 'BYWjIYx/lvRHvyNtLCS6BAsTWDHY+KAal3YiqaEKcmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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